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Tricks for interaction

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DDi Zhen
Last edited Jun 23, 2019
Created on Jun 23, 2019

This example demonstrates a world map with interactive hover effects, where each country changes color to red and displays its properties in the console. The visualization uses a Natural Earth projection via `d3.geoNaturalEarth1` and renders countries as SVG paths using `d3.geoPath`. Geographic data comes from the world-atlas TopoJSON file, processed with `topojson.feature`. The CSS `:hover` pseudo-class triggers the color change, while D3's `append('title')` logs country data to the console. The map includes a styled sphere background with a blue fill.

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